The HDF_NUMBER function returns the number of tags in an HDF file or the number of references associated with a given tag.
Syntax
Result = HDF_NUMBER( FileHandle [, TAG=integer] )
Return Value
Returns either the number of tags in the file or the number of references associated with the specified tag.
Arguments
FileHandle
The HDF file handle returned from a previous call to HDF_OPEN.
Keywords
TAG
Set this keyword to an integer tag number or the string '*'. If this keyword is set to a tag number, HDF_NUMBER returns the number of references associated with the given tag. If this keyword is set to the string '*', or is not specified, HDF_NUMBER returns the total number of tags in the HDF file.
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